Effects of Feeding Insect-Protected Corn and Corn Residue to Cattle, and Evaluation of Distillers Grains Storage When Mixed with Crop Residue on Cattle Performance

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Effects of Feeding Insect-Protected Corn and Corn Residue to Cattle, and Evaluation of Distillers Grains Storage When Mixed with Crop Residue on Cattle Performance University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Theses and Dissertations in Animal Science Animal Science Department Spring 2012 Effects of Feeding Insect-Protected Corn and Corn Residue to Cattle, and Evaluation of Distillers Grains Storage when Mixed with Crop Residue on Cattle Performance Barry Weber University of Nebraska-Lincoln, [email protected] Follow this and additional works at: https://digitalcommons.unl.edu/animalscidiss Part of the Animal Sciences Commons Weber, Barry, "Effects of Feeding Insect-Protected Corn and Corn Residue to Cattle, and Evaluation of Distillers Grains Storage when Mixed with Crop Residue on Cattle Performance" (2012). Theses and Dissertations in Animal Science. 51. https://digitalcommons.unl.edu/animalscidiss/51 This Article is brought to you for free and open access by the Animal Science Department at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Theses and Dissertations in Animal Science by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. EFFECTS OF FEEDING INSECT-PROTECTED CORN AND RESIDUE TO CATTLE, AND EVALUATION OF DISTILLERS GRAINS STORAGE WHEN MIXED WITH CROP RESIDUE ON CATTLE PERFORMANCE by Barry M. Weber A THESIS Presented to the Faculty of The Graduate College at the University of Nebraska In Partial Fulfillment of Requirements For the Degree of Master of Science Major: Animal Science Under the Supervision of Professors Galen E. Erickson and Terry J. Klopfenstein Lincoln, NE May 2012 EFFECTS OF FEEDING INSECT-PROTECTED CORN AND RESIDUE TO CATTLE, AND EVALUATION OF DISTILLERS GRAINS STORAGE WHEN MIXED WITH CROP RESIDUE ON CATTLE PERFORMANCE Barry M. Weber, M.S. University of Nebraska, 2012 Advisors: Galen E. Erickson and Terry J. Klopfenstein Research has been conducted on genetically modified corn fed to livestock since the introduction of insect resistant hybrids. While the overwhelming conclusion of these trials demonstrate nutritional equivalency to corn from non-transgenic hybrids, the introduction of new transgenes and combinations of resistance traits necessitates continued evaluation of genetically modified corn hybrids. Expansion of the ethanol industry has resulted in the increased availability of co-products for use as a livestock feed, as well as an increase in crop residues that offer unique opportunities for use by cattle producers. A finishing trial was conducted with corn and corn silage from MON 89034, which incorporates two genes encoding for insect resistance. The presence of the transgenes in MON 89034 did not impact finishing performance or carcass characteristics when compared to steers fed corn and corn silage from a near isogenic, non-transgenic parental hybrid and two non-transgenic reference hybrids. Growing steers were fed silage from corn hybrid MON 89034 and performance was compared to that of steers fed silage from the isogenic, non-transgenic parental hybrid and two non-transgenic reference hybrids. No differences in performance were observed. A grazing trial evaluated the performance of steers grazing corn residue from hybrid MON 89034 and its isogenic, non-transgenic parental hybrids, and no differences in performance were observed. An individual trial was conducted to determine the effects of ensiled (EN) or freshly mixed (FR) modified distillers grains with solubles (MDGS) blended with corn stalks (CS) or wheat straw (WS) at 30% or 50% diet DM. Steers offered EN blends had greater DMI, ADG, and G:F than steers fed FR blends. Growing steers were offered the same MDGS:crop residue blends as those in the individual trial, but as a supplement to a basal forage diet to determine palatability and forage intake replacement. Steers offered all mixes equaled or surpassed ADG and G:F of steers offered only the basal forage diet, with blends replacing 9.6% to 35.4% of the basal diet. Acknowledgements When I finally decided to return to school and obtain my M.S., I was cautious, not really knowing what to expect. Sure, I was excited, but being out of school for an extended period of time left me with doubts. All of them were erased, as this has been one of the most fulfilling experiences of my life on an intellectual and personal level. I’d first like to thank my parents, Dennis and Diane, for understanding and encouraging what we like to refer to as my “pre-mid-life crisis.” They’ve been patient and stood behind me and I’m indebted to them for it. My brother and sister-in-law, Matt and Sarah, along with my sister and brother-in-law, Susie and Ryan have supported me with minimal questions and I am thankful for their assistance when time became an issue. To my advisors, Dr. Galen Erickson and Dr. Terry Klopfenstein, I can’t thank you enough for giving me a chance and encouraging me. I’d also like to thank Dr. Rick Rasby and Dr. Paul Kononoff for serving on my committee and all of the technicians for their help in answering questions as well as planning and executing my trials. I’m not even sure where to begin thanking the other graduate students who have become incredible friends. Brandon, Annie, Amy, Anna, Adam, Cody S., Cody N., Will, Josh, Kelsey, Jana, Curt, Alex, Ace, and Derek, you’ve made this experience so much more than I could have ever expected. Whether working all day at the feedlot or horsing around outside of our duties as graduate students, I’ve cherished every minute. Mallorie, simple words typed on paper in no way can express my appreciation and gratitude for the listening, the understanding, the great times, and for becoming my best friend. Barry Table of Contents FEEDING INSECT PROTECTED CORN AND RESIDUE TO CATTLE INTRODUCTION…………………………………………………...................................1 REVIEW OF LITERATURE……………………………………………………………..3 History of Genetically Modified Corn…………………………………………….3 Transgenic Corn as a Livestock Feed……………………………………………..4 Transgenic Corn in Finishing Feedlot Diets………………………………………5 Transgenic Corn Silage in Cattle Diets……………………………………………8 Grazing Transgenic Corn Residue…………………………………………….....10 Transgenic Corn in Swine and Poultry Diets………………………………….....11 Research Objectives……………………………………………………………...12 Literature Cited…………………………………………………………………..13 EVALUATION OF DISTILLERS GRAINS STORAGE WHEN MIXED WITH CROP RESIDUE ON CATTLE PERFORMANCE REVIEW OF LITERATURE ……………………………………………………………18 Ethanol Co-Products……………………………………………………………..18 Usage of Crop Residue…………………………………………………………..19 Supplementation of Cattle with Ethanol Co-Products…………………………...20 Grazed Forage Replacement with Distillers Grains……………………………...23 Storage Methods of Distillers Grains…………………………………………….24 Moisture of Diets………………………………………………………………...26 Research Objectives……………………………………………………………...26 Literature Cited…………………………………………………………………..27 EFFECTS OF FEEDING CORN GRAIN AND CORN SILAGE OR GRAZING RESIDUES FROM A SECOND GENERATION INSECT PROTECTED HYBRID (MON 89034) COMPARED TO PARENTAL AND REFERENCE HYBRIDS ON ANIMAL PERFORMANCE AND CARCASS CHARACTERISTICS………………...32 Abstract…………………………………………………………………………..33 Introduction………………………………………………………………………34 Materials and Methods…………………………………………………………...35 Results and Discussion…………………………………………………………..41 Literature Cited…………………………………………………………………..45 Tables…………………………………………………………………………….49 EFFECTS OF FORAGE TYPE, STORAGE METHOD, AND MOISTURE LEVEL IN CROP RESIDUES MIXED WITH MODIFIED DISTILLERS GRAINS………………55 Abstract…………………………………………………………………………..56 Introduction………………………………………………………………………57 Materials and Methods…………………………………………………………...58 Results and Discussion…………………………………………………………..63 Conclusions………………………………………………………………………70 Literature Cited…………………………………………………………………..71 Tables…………………………………………………………………………….73 1 Introduction The introduction of genetically engineered crops to the United States in 1996 has been met with great success and acceptance in conventional agriculture. The incorporation of genes providing insect protection and herbicide resistance has not only led to increased crop yields, but decreased herbicide and pesticide usage. Genetic modifications providing for insect resistance in corn are based upon the insertion of DNA from Bacillus thuringiensis , a native soil bacterium. The foreign DNA produces a crystalline protein that is toxic to several species of insects that harm yields and would otherwise necessitate pesticide applications and more intensive management. Insect protected corn, commonly called Bt corn, was planted on 73% of all corn acres in the United States in 2010 (USDA, 2010). Because such a large percentage of domestic corn production is used as livestock feed, it is necessary to ensure that genetic modifications do not negatively affect the nutritional composition of the grain, silage, or residue. There have been multiple experiments evaluating livestock performance when fed Bt corn, and scientists have concluded that the incorporation of the insect protected gene results in animal performance similar to non-transgenic corn. Nonetheless, different combinations of genes in specific hybrids, often referred to as double or triple stacked hybrids, must be evaluated to ensure acceptance as a livestock feed. The growth of the ethanol industry in the midwestern United States has resulted in the adoption of distillers grains with solubles as a staple in feedlot diets. Typically, cattle on feed numbers decrease in the summer months in the midwest, resulting in decreased 2 demand for distillers grains and seasonally lower prices (Waterbury and Mark, 2008). Producers can take advantage of these lower
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